The 777 is a full generation ahead of the A320/A330/A340. From a maintenance perspective the Boeing is the hands down winner. When we pull into places that the Airbus flies as well the engineers are always complimentary of the 777, but not of the Airbus. Airbus ( the company ) is now offering to pay potential customers the operating cost differential between the A340 and the 777. The 777 is so much more efficient it isn't even a contest. It can carry ten tonnes more payload while burning 10 tonnes less fuel over a typical long haul route. That while getting there 30 minutes faster.
You can't judge Boeing because you flew a 767 simulator. Nor can you fully judge an Airbus because you flew an Airbus 320 simulator. It's the whole package that you have to look at.
Typhoonpilot